JACKSON, Wyo. – May 2025 was warmer than normal and slightly wetter than normal in Jackson Hole, although the pattern dried out toward the end of the month. June is expected to be warmer and drier than normal as the summer season gets underway.
May 2025 Review
May featured above normal temperatures and above normal precipitation in the town of Jackson, though for Teton County as a whole, precipitation ended up near average.
Temperatures in May 2025 were 2.1ºF warmer than normal in Jackson (compared to 2010-2024), with an average high of 64.9ºF and an average low of 33.6ºF. The warmest temperature of the month was 82ºF on May 31, and the coldest temperature of the month was 21ºF on May 2.
We did have one extended cool spell during the middle of the month, with cooler-than-normal temperatures from May 13-21, while the rest of the month was generally warmer than normal.
Here is a table showing monthly average temperatures, departure from normal temperatures, precipitation, and snowfall in the town of Jackson since October.
Jackson received 2.58 inches of precipitation in April, which is above the 2010-2024 average of 2.13 inches. Precipitation was more boom or bust in May than it often is, with measurable precipitation occurring on 12 days.
There were two days with heavy rainfall in Jackson, with 24-hour totals of 0.72 inches on May 6 and 1.18 inches on May 18. The 1.18 inches recorded on May 18 was the highest precipitation total in town since March 2, 2024, when 1.30 inches of precipitation (and 16 inches of snow) were recorded.
May is Jackson’s rainiest month on average, and while we did see some significant rainfall, the final 10 days of the month were very dry with only 0.02 inches of rainfall recorded.
The table below shows monthly precipitation compared to average in the town of Jackson since October.
Occasionally, Jackson can see measurable snowfall in May with an average monthly snowfall of 1.1 inches. We had a few instances of snow mixing in with rain early this month, but nothing measurable occurred in town.
For the season as a whole, the town of Jackson will finish with 91.5 inches of snowfall, which is just slightly below its average of 94.8 inches.
In the mountains, the Rendezvous Bowl Plot at 9,580 feet received 24 inches of snowfall in May, which is slightly below its May average of 31 inches.
For the season as a whole, the Rendezvous Bowl Plot has received 495 inches of snowfall since October 1. Winter snowfall was right around average in the Tetons this season, though high elevation snowpack is below average heading into June due to warmer-than-normal temperatures this spring.
June 2025 Outlook
June is off to a dry start as moisture from recent weather systems has remained too far south and east of Jackson Hole.
The dry spell looks to continue through the weekend with cooler temperatures mid-week giving way to warmer temperatures by the weekend with highs reaching the 70s and 80s in Jackson.
Next week, there are some hints of disturbances tracking across the Northern Rockies, which could lead to a chance of showers and thunderstorms, though it’s too early to say whether or not we will see anything more than light and spotty rainfall.
Here is a 7-day precipitation projection from the European Ensemble weather model, which represents the average of 50 simulations of this model.
June is a month in which we transition from spring to summer conditions in Jackson, and we can see elements of both with stretches of warm and dry conditions occasionally interspersed with stretches of cool and wetter conditions. Thunderstorms are also common in June.
The average high temperature in Jackson in June is 72.9ºF, and the average low temperature is 40.4ºF. Early in the month, average highs are in the upper 60s, while late in the month, average highs are in the upper 70s.
Average rainfall in June in Jackson is 1.38 inches, making it the second driest month of the year behind July. However, June rainfall can fluctuate significantly from year to year. Last year, we only received 0.63 inches of rainfall in June, but in 2023, we received 2.64 inches of rainfall in June.
Severe thunderstorms are less common in Teton County compared to most of the country, but they can occasionally happen, and historically, June is the month in which they are most likely to occur.
To be classified as “severe”, a thunderstorm must produce one of the following: 58 mph wind gusts, 1″ diameter hail, or a tornado.
In June of 2022, an EF-2 tornado hit the Gros Ventre Wilderness just north of Sheep Mountain, producing a 2-mile damage path through a heavily forested area. The same weather system also produced devastating flooding in Yellowstone.
For June 2025, conditions are expected to be warmer and drier than normal across Teton County and most of Wyoming. But we could still occasionally see periods of inclement weather, despite the overall dry outlook.
Alan Smith, Meteorologist
